Seminario de Martín Rodríguez Monroy (Ruhr Universität Bochum - German Centre for Cosmological Lensing)

"Dealing with observational systematic effects in Stage IV photometric surveys"
Martín Rodríguez Monroy
(Ruhr Universität Bochum - German Centre for Cosmological Lensing)

Abstract: With the dawn of Stage IV cosmological surveys, such as Euclid and LSST DESC, and their ability to observe millions of galaxies,
statistical errors are shrinking to levels even lower than those achieved by Stage III surveys, such as DES, consolidating cosmology a  precision science.
In turn, systematic effects are becoming the main  source of uncertainty, so dealing with them will be one of the main challenges that these surveys
have to face. Therefore it will be  essential to know in detail the different sources of systematic effects  and to correct for them appropriately in order
to avoid significant  biases on the results from different probes. In this presentation, we  will focus on two sources of systematic uncertainty: spatially
varying observational systematics and atmospheric conditions. The former affects both Euclid and LSST-DESC, and we will explore the methods and
lessons  learnt from the DES-Y3 in the context of galaxy clustering. For the  latter, we will introduce LSST’s Auxiliary Telescope (AuxTel), whose  purpose
is to measure atmospheric transparency and to derive color corrections based on spectroscopic observations. We will also introduce  some of the
instrumental updates carried out in AuxTel during 2023 to  improve its performance. 

Fecha: jueves, 11 de diciembre de 2025
Hora:   12:10 horas
Lugar: Seminario de Física Teórica